Fluid filter with localized flow attachment

ABSTRACT

A fluid filter device is described, where a flow attachment member provides a unique interface between the filtering element and a filter head. The fluid filter described herein generally provides a flow structure that is localized and sealed. The flow attachment member is configured to communicate fluid into and out of the fluid filter, and is configured to localize fluid flow both into and out of the fluid filter within a separating structure of the flow attachment member. The flow attachment member further includes a seal structure configured to substantially prevent or at least confine leakage to a localized area away from proximity of the edges of the housing.

FIELD

A fluid filter is disclosed having a flow attachment that localizes fluid flow into and out of the fluid filter within a separating structure of the flow attachment, and where the separating structure includes a sealing structure disposed thereon.

BACKGROUND

Fluid filters are widely known and used in a variety of systems requiring filtration of a working fluid. After use and wear, many fluid filters eventually must have their filter elements serviced and/or replaced, and many fluid filters themselves must be removed in order to be serviced and/or replaced. Thus, ease and cleanliness of service have been concerns in fluid filter design. Preventing leakage or at least confining leakage has presented challenges in the sealing structure of such fluid filters. In one example shown in FIG. 25, a typical spin-on filter 900 includes a metallic nutplate 914 that typically is employed for allowing unfiltered fluid to flow into opening 922. The unfiltered fluid filters through a filter media 910, and the filtered fluid flows out of opening 920. Such filters generally require a large seal 916 around the outer edge of the housing 912 and between the housing 912 and nutplate 914. An additional seal 918 is further required around the attaching spud and between the spud and the nutplate.

While previous designs have been useful, improvements and modifications can still be made in fluid filter design.

SUMMARY

The following technical disclosure describes an improved fluid filter. The fluid filter described herein includes a housing having a filter media disposed therein. A flow attachment member is configured to communicate fluid to be filtered to the filter media, and is configured to communicate fluid filtered by the filter media out of the fluid filter. The flow attachment member includes a structure that is configured to localize fluid flow both into and out of the fluid filter. The flow attachment member further includes a seal structure to substantially prevent or at least confine leakage.

Some benefits of such a fluid filter can include allowing for a more clean service, since flow into and out of the fluid filter is localized within the flow attachment member. As a result, a filter can be provided that is more environment friendly and is more pleasing to customers and users. The fluid filter described herein also can substantially prevent or at least confine leakage to a localized area and away from proximity of edges of the housing, since a seal structure is provided on the flow attachment member. Thus, additional external and internal seals can be eliminated, where a fluid filter can be provided that is relatively inexpensive, reliable, and has fewer parts. Further, the flow attachment can eliminate the need for a nutplate as employed in many fluid filters, such as in spin-on type fluid filters. The flow attachment can provide a unique head and filter interface that may give OEM improved aftermarket business.

Even further, the flow attachment member can provide a benefit of pre-filling a fluid filter in the unfiltered containment region, such as the “dirty side.” For example, traditional fuel filters are pre-filled before installation in the clean compartment region (or “clean side”). In such flow configurations, the pre-filled fluid is already on the clean side and is allowed to enter the fuel system at first. Such pre-filling can be detrimental to newer high-pressure common rail fuel systems that require fine particle filtration. The flow attachment member disclosed herein can utilize a flow redirection concept through the flow attachment member that effectively diverts pre-filled fluid through the filtration media before it can enter the fuel system. That is, the flow attachment member described herein allows for a pre-filtering function of the pre-filled fluid before the fluid is allowed to enter exit the fluid filter.

In one embodiment, a fluid filter includes a housing and filter media disposed within the housing. An endplate is disposed at one end of the filter media. The filter media is configured to allow fluid to be filtered through the filter media from one side to another side. A flow attachment member is disposed at an end opposite the end that the endplate is disposed. The flow attachment member is configured to communicate fluid to be filtered to the filter media, and is configured to communicate fluid filtered by the filter media out of the fluid filter. The flow attachment member is configured to localize fluid flowing both into and out of the fluid filter within a separating structure of the flow attachment member. The flow attachment member includes a seal structure disposed on an outer surface of the separating structure.

In one embodiment, the housing is generally open at one end and closed at an opposite end. The open end is configured to receive the filter media, and is engaged with the flow attachment member in a fluid tight seal. The flow attachment member is engaged with the filter media in a fluid tight seal to maintain separated fluid flow.

In one embodiment, the separating structure of the flow attachment member is disposed generally proximate a center region of the fluid filter and generally away from proximity of an outer edge of the housing. In yet another embodiment, the flow attachment member is a stem that houses the separating structure, the stem extends away from the filter media and outwardly from the open end of the housing. In one embodiment, the stem is generally disposed at a center region of the open end, where fluid flow into and out of the fluid filter is concentrated proximate the center.

In yet another embodiment, the flow attachment member is a separate adapter structure, which can also be connected to a head of an already existing fluid filter. As one example, the flow attachment member can be configured as an adapter for use with traditional spin-on filters. Such a flow attachment member would connect to and seal the separate flow openings of the existing filter's nutplate. More specifically, the flow attachment member would direct unfiltered fluid and filtered fluid through its separating structure. In such a configuration, fluid flow can be re-routed through the flow attachment member, while allowing usual flow within a standard style filter (e.g. spin-on filter).

In one embodiment, the seal structure on the separating structure includes at least one sealing member axially disposed on the outer surface of the separating structure. In one example, the sealing member is an o-ring. In yet another embodiment, the sealing structure includes a plurality of sealing members, where the sealing members may be o-rings. In some examples, the seal structure can include but is not limited to one of two resilient o-rings, a combination of a resilient o-ring and face seal having a gasket member, or two face seals each having a gasket member.

In yet another embodiment, the fluid filter is fully disposable.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 illustrates a side view of one embodiment of a fluid filter.

FIG. 2 illustrates an end perspective view of the fluid filter of FIG. 1.

FIG. 3 illustrates a side sectional view of the fluid filter taken from line 3-3 of FIG. 1.

FIG. 4 illustrates a side sectional view of the fluid filter taken from line 4-4 of FIG. 1.

FIG. 5 illustrates a side view of another embodiment of a fluid filter.

FIG. 6 illustrates an end perspective view of the fluid filter of FIG. 5.

FIG. 7 illustrates a side sectional view of the fluid filter taken from line 7-7 of FIG. 5.

FIG. 8 illustrates a side sectional view of the fluid filter taken from line 8-8 of FIG. 5.

FIG. 9 illustrates another sectional view of the fluid filter of FIG. 5 showing one embodiment of a flow configuration therethrough.

FIG. 10 illustrates a partial sectional view of the fluid filter of FIG. 5.

FIG. 11 illustrates a sectional view of yet another embodiment of a fluid filter.

FIG. 12 illustrates another sectional view of the fluid filter of FIG. 11 and showing one embodiment of a flow configuration therethrough.

FIG. 13 illustrates a sectional view of another embodiment of fluid filter.

FIG. 14 illustrates a sectional view of yet another embodiment of fluid filter.

FIG. 15 illustrates a sectional view of yet another embodiment of fluid filter.

FIG. 16 illustrates a sectional view of yet another embodiment of fluid filter.

FIG. 17 illustrates a side view of yet another embodiment of a fluid filter.

FIG. 18 illustrates a side view of the fluid filter of FIG. 17 and showing one embodiment of an attachment head connected to the fluid filter.

FIG. 19 illustrates a sectional view of the fluid filter and attachment head of FIG. 18.

FIG. 20 illustrates a perspective view of the fluid filter of FIG. 17.

FIG. 21 illustrates a side view of yet another embodiment of a fluid filter.

FIG. 22 illustrates a perspective view the fluid filter of FIG. 21.

FIG. 23 illustrates a sectional view of the fluid filter of FIG. 21 and showing one embodiment of an attachment head connected to the fluid filter.

FIG. 24 illustrates another side sectional view of the fluid filter of FIG. 21 and showing another embodiment of an attachment head connected to the fluid filter.

FIG. 25 illustrates a sectional view of a known fluid filter.

FIG. 26 illustrates a perspective view of an embodiment of a flow attachment member.

FIG. 27 illustrates a side view of the flow attachment member of FIG. 26.

FIG. 28 illustrates a side sectional view of the flow attachment member of FIG. 26.

FIG. 29 illustrates a perspective view of the flow attachment member of FIG. 26.

FIG. 30 illustrates a side sectional view of the flow attachment member of FIG. 26.

DETAILED DESCRIPTION

The fluid filter described herein generally provides a flow structure that is localized and sealed. For example, the fluid filter described herein includes a flow attachment member configured to communicate fluid to be filtered by a filter media into the fluid filter, and configured to communicate fluid filtered by the filter media out of the fluid filter. The flow attachment member is configured to localize fluid flow both into and out of the fluid filter within a flow structure of the flow attachment member. The flow attachment member further includes a seal structure disposed on an outer surface of the structure of the flow attachment member. The fluid filter described herein can allow for cleaner servicing of the fluid filter, and can allow for a pre-filtering function, since flow into and out of the fluid filter is localized within particular flow paths created by the flow attachment member. The fluid filter described also can substantially prevent or at least confine leakage to a localized area away from proximity of the edges of the housing, as the sealing structure seals the localized flow within the flow attachment member.

It will be appreciated that “fluid to be filtered” is meant as any working fluid requiring filtration in a process or system, such as but not limited to fuel, oil, coolant, or the like. Also, a fluid filter as described herein can be useful in a variety of filter systems, such as but not limited to, oil and lube filtration and fuel filtration systems. As some examples only, the fluid filter described is particularly useful in fuel and lube filtration systems.

FIGS. 1-4 illustrate one embodiment of a fluid filter 10. The fluid filter 10 includes a housing 12. The housing 12 generally is a cylindrical container or shell. The housing 12 includes an end with a plurality of supporting members 16. The supporting members 16 protrude outward from the housing 12, and are radially disposed proximately to and about the end. In one embodiment, the supporting members 16 generally resemble rib-like portions. The housing 12 also includes an external attachment feature 14 disposed proximate an opposite end that the supporting members 16 are disposed. As some examples, the external attachment feature 14 may be constructed as a threaded configuration, bayonet, or the like. It will be appreciated that the supporting members 16 and the external attachment feature 14 are not limited to the specific structure shown, and may be modified using various structures as may be suitable and/or necessary.

A flow attachment member 20 is disposed at an end that is opposite the supporting members 16. The flow attachment member 20 connects to the housing 12 distal to the external attachment feature 14. In one embodiment, the flow attachment member 20 resembles a lid, cap, or cover-like structure having a stem 21 extending outwardly and distally relative to the end of the housing 12. The stem 21 includes an inlet 24 so that fluid to be filtered can enter the housing 12 and so that fluid can access a flow path to the filter media 30. See arrows in FIG. 3. The stem 21 also includes an outlet 26 so that fluid that has been filtered by the filter media 30 can exit the housing 12. See arrows in FIG. 4. As shown, the inlet 24 and outlet 26 are confined within the stem 21 of the flow attachment member 20, where a separating structure or flow separator 25 maintains flow through the inlet 24 and outlet 26 separate from each other.

Grooves 22 are disposed about an outer surface of the stem 21. As shown, the grooves 22 are disposed circumferentially around the stem 21. In one embodiment, the grooves 22 are configured as part of a sealing structure that can hold sealing members (not shown here, but shown in embodiments of FIGS. 11-16). The sealing members may be various structures, such as but not limited to resilient o-ring seals. It will be appreciated that the sealing structure may be accomplished in a variety of ways as one of skill in the art can construct, and may include examples such as but not limited to the o-ring seals described, various gasket configurations, and an interference-type fit. As shown, the grooves 22 provide for a sealing structure such as a dual o-ring seal. It will be appreciated that one o-ring seal or more than two o-ring seals may be employed as desired and/or necessary. It further will be appreciated that o-ring seals may not be used, or may be used in combination with other sealing structures, such as but not limited to gasket seals or interference fit seals.

As with other fluid filters described herein, the stem 21 is configured to provide a unique interface between the filtering element and a filter head. Such a unique interface would have a radially fluid tight seal at the stem 21, where flow into and out of the fluid filter 10 is localized by flow paths of the flow attachment member 20, and which are accessed through the inlet 24 and outlet 26 and confined within the stem 21. As shown, the stem 21 is relatively disposed proximate, or substantially at a center region, and generally at the open end of the housing 12. The stem 21 is shown disposed away from proximity of the perimeter wall edges of the housing 12. As one example, the stem 21 substantially is disposed about a longitudinally centered axis of the overall fluid filter 10.

The housing 12 and flow attachment member 20 are connected in a fluid tight seal at their outer walls. In one embodiment, the housing 12 and the flow attachment member 20 are connected via a spin weld configuration. As shown, the housing 12 includes grips 18 and the flow attachment member 20 includes grips 28. In one example, the grips 18, 28 are used to connect the housing 12 and the flow attachment member 20 through a spin-welding process. Grips 18 are disposed about an outer surface of the housing 12, while grips 28 are disposed on an outer surface of the flow attachment member 20 and radially outward from the stem 21. In one embodiment, the grips 18, 28 generally resemble sawtooth grips. It will be appreciated that that the grips are not limited to the specific structure shown, and may be modified as suitable and/or necessary. It will further be appreciated that the housing 12 and flow attachment member 20 may not be connected via spin-welding, but by some other approach, so long as the fluid tight seal is achieved between the housing 12 and flow attachment member 20.

Turning to the filter media 30, the filter media 30 is disposed within the housing 12. The filter media 30 is connected to an endplate 32 disposed proximate the end where the support members 16 are disposed. The filter media 30 is configured to connect with the flow attachment member 20 in a fluid tight seal through another endplate 34. The filter media 30 is connected with another endplate 34. As shown, the filter media 30 is disposed between endplates 32, 34. The endplate 34 is disposed at an opposite end from the endplate 32, where the endplate 34 can sealingly engage with the flow attachment member 20 in a fluid tight seal.

In one embodiment, the flow attachment member 20 and the endplate 34 are connected by a press fit. As one example, the flow separator 25 includes an outer annular surface that sealingly engages with an annular surface and shoulder of the endplate 34. In such a configuration, the filter media 30 is connected to the flow attachment member 20 through a sealing engagement between the endplate 34 and the flow separator 25. In one embodiment, the filter media 30, the endplates 32, 34, and a center tube 36 (described in further detail below) together provide a cartridge assembly that is connected with the flow attachment member 20 in a fluid tight seal. It will be appreciated that the engagement between the endplate 34 and the flow attachment member 20 is not limited to the specific structure shown or to a press fit technique. Various configurations may be employed for attaching the filter media 30 to the flow attachment member 20 as desired and/or necessary, so long as the fluid tight seal is accomplished.

The filter media 30 may be constructed in various configurations, such as but not limited to a spiral wrap, pleated, insert molded, stack disc, or flow through configurations, combinations of these, or the like. As shown in FIG. 3, the filter media 30 has a pleated configuration having folds 31. It will be appreciated that the material used for constructing the filter media 30 is not limited, so long as the filter media 30 will provide the desired filtering effect for its particular application.

In FIGS. 3 and 4, fluid flowing through the fluid filter 10 enters inlet 24 (see FIG. 3) and exits outlet 26 (see FIG. 4). As described, the stem 21 contains both the inlet 24 and outlet 26, where a flow separator 25 maintains the separate flow into and out of the fluid filter 10 (best shown in embodiment of FIGS. 9 and 10 for flow separator 125).

Fluid enters the housing 12 from the inlet 24 and travels to an outer side of the filter media 30 and to a space between the filter media 30 and the inner wall of the housing 12. Fluid can then be filtered through the filter media 30 to its inner side. A center tube 36 is disposed within the filter media 30. In one example, the center tube 36 cooperates with the filter media 30 in a concentric configuration, where a plurality of openings 37 allow for fluid filtered by the filter media 30 to enter the center tube 36 and exit through the outlet 26. See arrows in the housing 12, filter media 30, and center tube 36. As with the filter media 30, the center tube 36 is disposed between the endplates 32, 34, and can provide further structural support for the filter media 30.

The flow configuration of FIGS. 1-4 provide a generally radial fluid flow at first, where fluid entering the inlet 24 is directed radially outward to a position between the filter media 30 and housing 12. As described, the flow attachment member 20, its stem 21, and the seal structure provide a separated incoming and outgoing fluid flow that is localized away from edges of the housing. In such a configuration, an external seal often employed in spin-on filters between a nutplate and housing can be eliminated. Further, a nutplate in such designs may also be eliminated. See for example FIG. 25.

FIGS. 5-10 illustrate another embodiment of a fluid filter 100. The fluid filter 100 is similar to the fluid filter 10, except that fluid filter 100 includes an external attachment feature 114 disposed on an outer cylindrical surface of the flow attachment member 120, rather than on the housing 112.

The housing 112 generally is a cylindrical container or shell and includes an end with a plurality of supporting members 116. The supporting members 116 protrude outward from the housing 112, and are radially disposed proximately to and about the end. In one embodiment, the supporting members 116 generally resemble rib-like portions. The housing 112 also includes an external attachment feature 114 disposed proximate an opposite end that the supporting members 116 are disposed. As some examples, the external attachment feature 114 may be constructed as a threaded configuration, bayonet, or the like. As in FIGS. 1-4, it will be appreciated that the supporting members 116 and the external attachment feature 114 are not limited to the specific structure shown, and may be modified using various structures as may be suitable and/or necessary.

A flow attachment member 120 is disposed at an end that is opposite the supporting members 116. The flow attachment member 120 is connected to the housing 112 distal to the external attachment feature 114. In one embodiment, the flow attachment member 120 resembles a lid, cap, or cover-like structure having a stem 121 extending outwardly and distally relative to the open end of the housing 112. The stem 121 includes an inlet 124 so that fluid to be filtered can enter the housing 112 and so that fluid can access a flow path to the filter media 130. See arrows in FIG. 7. The stem 121 also includes an outlet 126 so that fluid that has been filtered by the filter media 130 can exit the housing 112. See arrows in FIG. 8. As shown, the inlet 124 and outlet 126 are confined within the stem 121 of the flow attachment member 120, where a flow separator 125 maintains flow through the inlet 124 and outlet 126 separate from each other.

Grooves 122 are disposed about an outer surface of the stem 121. As shown, the grooves 122 are disposed circumferentially around the stem 121. In one embodiment, the grooves 122 are configured as part of a sealing structure that can hold sealing members (not shown here, but shown in embodiments of FIGS. 11-16). The sealing members may be various structures, such as but not limited to resilient o-ring seals. It will be appreciated that the sealing structure may be accomplished in a variety of ways as one of skill in the art can construct. Some examples may include but are not limited to the o-ring seals described, various gasket configurations, and an interference-fit type structures. As shown, the grooves 122 provide for a sealing structure that is a dual o-ring seal. It will be appreciated that one o-ring seal or more than two o-ring seals may be employed as desired and/or necessary. It further will be appreciated that o-ring seals may not be used, or may be used in combination with other sealing structures, such as but not limited to gasket seals or interference fit seals.

As with the other fluid filters described herein, the stem 121 is configured to provide a unique interface between the filtering element and a filter head. Such a unique interface would have a radially fluid tight seal at the stem 121, where flow into and out of the fluid filter 100 is localized by flow paths of the flow attachment member 120, which are accessed through the inlet 124 and outlet 126 and confined within the stem 121. As shown, the stem 121 is relatively disposed proximate, or substantially at a center region, and generally at the open end of the housing 112. The stem 121 is shown disposed away from proximity of the perimeter wall edges of the housing 112. As one example, the stem 121 substantially is centrally disposed about a longitudinally centered axis of the fluid filter 100.

The housing 112 and flow attachment member 120 are connected in a fluid tight seal at their outer walls. In one embodiment, the housing 112 and the flow attachment member 120 are connected via a spin weld configuration. As shown, the housing 112 includes grips 118 and the flow attachment member 120 includes grips 128. In one example, the grips 118, 128 are used to connect the housing 112 and the flow attachment member 120 through a spin-welding process. Grips 118 are disposed about an outer surface of the housing 112, while grips 128 are disposed on an outer surface of the flow attachment member 120 and radially outward from the stem 121. In one embodiment, the grips 118, 128 generally resemble sawtooth grips. It will be appreciated that that the grips are not limited to the specific structure shown, and may be modified as suitable and/or necessary. It will further be appreciated that the housing 112 and flow attachment member 120 may not be connected via spin-welding, but by some other approach, so long as the fluid tight seal is achieved between the housing 112 and flow attachment member 120.

Turning to the filter media 130, the filter media 130 is disposed within the housing 112. The filter media 130 is connected to an endplate 132 disposed proximate the end where the support members 116 are disposed. The filter media 130 is configured to connect with the flow attachment member 120 in a fluid tight seal through another endplate 134. The filter media 130 is connected with another endplate 134. As shown, the filter media 130 is disposed between endplates 132, 134. The endplate 134 is disposed at an opposite end from the endplate 132, where the endplate 134 can sealingly engage with the flow attachment member 120 in a fluid tight seal.

In one embodiment, the flow attachment member 120 and the endplate 134 are connected by a press fit. As one example, the flow separator 125 includes an outer annular surface that sealingly engages with an annular surface and shoulder of the endplate 134. In such a configuration, the filter media 130 is connected to the flow attachment member 120 through a sealing engagement between the endplate 134 and the flow separator 125. In one embodiment, the filter media 130, the endplates 132, 134, and a center tube 136 (described in further detail below) together provide a cartridge assembly that is connected with the flow attachment member 120 in a fluid tight seal. It will be appreciated that the engagement between the endplate 134 and the flow attachment member 120 is not limited to the specific structure shown or to a press fit technique, and that other configurations may be employed for attaching the filter media 130 to the flow attachment member 120 as desired and/or necessary, so long as the fluid tight seal is accomplished. As some examples, the fluid tight seal between the filter media and the flow attachment member 120 can be accomplished through a two-shot molded seal, a trapped seal from two engaged components, or an insert molded seal.

The filter media 130 may be constructed in various configurations, such as but not limited to a spiral wrap, pleated, insert molded, stack disc, or flow through configurations, combinations of these, or the like. As shown in FIGS. 7 and 8 the filter media 130 has a pleated configuration having folds 131. It will be appreciated that the material used for constructing the filter media 130 is not limited, so long as the filter media 130 will provide the desired filtering effect for its particular application.

In FIGS. 7 and 8, fluid flowing through the fluid filter 100 enters inlet 124 (see FIG. 7) and exits outlet 126 (see FIG. 8). As described, the stem 121 contains both the inlet 124 and outlet 126, where a flow separator 125 maintains the separate flow into and out of the fluid filter 100 (best shown in FIGS. 9 and 10).

Fluid enters the housing 112 from the inlet 124 and travels to an outer side of the filter media 130 and to a space between the filter media 130 and the inner wall of the housing 112. Fluid can then be filtered through the filter media 130 to its inner side. A center tube 136 is disposed within the filter media 130. In one example, the center tube 136 cooperates with the filter media 130 in a concentric configuration, where a plurality of openings 137 allow for fluid filtered by the filter media 130 to enter the center tube 136 and exit through the outlet 126. See arrows in the housing 112, filter media 130, and center tube 136. As with the filter media 130, the center tube 136 is disposed between the endplates 132, 134, and can provide further structural support for the filter media 130.

The flow configuration of FIGS. 5-10 provide a generally radial fluid flow at first, where fluid is directed radially outward to a position between the filter media 130 and housing 112. As described, the flow attachment member 120, its stem 121, and the seal structure provide a separated incoming and outgoing flow that is localized away from edges of the housing. In such a configuration, an external seal often employed in spin-on filters between a nutplate and housing can be eliminated. Further, a nutplate in such designs may also be eliminated if desired and/or necessary. See FIG. 25.

FIG. 9 shows more closely the entire flow path of the fluid through the fluid filter 100. FIG. 10 shows more closely the flow attachment member 120 structure including the flow separator 125. The flow separator 125 includes an opening 124 a where the inlet 124 allows fluid to access the interior of the housing 112 and move to the filter media 130. The flow separator 125 also includes an opening 126 a where fluid that has been filtered can access the outlet 126 and exit the filter media 130 and center tube 136. It will be appreciated that the fluid filter 10 may include the same flow configuration and openings as shown in FIGS. 9 and 10.

As further shown in FIG. 10, a groove 119 may be disposed at an outer surface of the housing 119 and proximate the external attachment feature 114. In one embodiment, the groove 119 may be provided as a position for an external seal member to be disposed if desired. It will be appreciated that the groove 119 may not be necessary for the housing 112 given the flow structure of the stem 121 and its outer seal structure. As one example, however, the groove 119 may be a square cut groove that can hold an o-ring seal or other gasket member if desired.

FIGS. 11-12 illustrate another embodiment of a fluid filter 200. The fluid filter includes a flow attachment member 220 generally configured with adjacent flow passages within a stem 221, where one flow passage leads fluid to be filtered to a filter media 230 through an inlet 224, and the other flow passage allows fluid to exit the fluid filter 200 through an outlet 226.

Similar to the other fluid filters described, fluid filter 200 includes a housing 212. The housing 212 generally is a cylindrical container or shell. The entire outer surface of the housing 212 is not shown, so that the inside of the fluid filter 200 can be conveniently shown. It will be appreciated the remaining outer surface of the housing is consistent with the outer surface which is shown. The housing 212 includes an end with a plurality of supporting members 216. The supporting members 216 protrude outward from the housing 212, and are radially disposed proximately to and about the end. In one embodiment, the supporting members 216 generally resemble rib-like portions. The housing 212 also includes an external attachment feature 214 disposed proximate an opposite end that the supporting members 216 are disposed. As some examples, the external attachment feature 214 may be constructed as a threaded configuration, bayonet, or the like. As in FIGS. 1-4, it will be appreciated that the supporting members 216 and the external attachment feature 214 are not limited to the specific structure shown, and may be modified using other structures as may be suitable and/or necessary.

A flow attachment member 220 is connected to the housing and is disposed proximate the end that is opposite the supporting members 216. In one embodiment, the flow attachment member 220 includes a flow separator 225 having a stem 221 connected to a plate member. In one example, the stem 221 extends through the plate member. The stem 221 extends outwardly and distally from an end of the filter media 230. In one example the stem 221 extends beyond the open end of the housing 212.

The stem 221 includes the inlet 224 so that fluid to be filtered can enter the housing 212 and so that fluid can access a flow path to the filter media 230. See arrows in FIG. 12. The stem 221 also includes the outlet 226 so that fluid that has been filtered by the filter media 230 can exit the housing 212 after traveling through a flow path from the filter media 130. As shown, the inlet 224 and outlet 226 are confined within the stem 221 of the flow attachment member 220, where the flow separator 225 maintains flow through the inlet 224 and outlet 226 separate from each other.

Grooves 222 are disposed about an outer surface of the stem 221. As shown, the grooves 222 are disposed circumferentially around the stem 221. In one embodiment, the grooves 222 are configured as part of a sealing structure that can hold sealing members 222 a. The sealing members 222 a may be various structures, such as but not limited to o-ring seals. It will be appreciated that the sealing structure may be accomplished in a variety of ways as one of skill in the art can construct. Some examples may include but are not limited to the o-ring seals described, various gasket configurations, and interference-fit type structures. As shown, the grooves 222 provide for a sealing structure such as a dual o-ring seal. It will be appreciated that one o-ring seal or more than two o-ring seals may be employed as desired and/or necessary. It further will be appreciated that o-ring seals may not be used, or may be used in combination with other sealing structures, such as but not limited to gasket seals or interference fit seals.

As with the other fluid filters described, the stem 221 is configured to provide a unique interface between the filtering element and a filter head. Such a unique interface would have a radially fluid tight seal at the stem 221, where flow into and out of the fluid filter 200 is localized by flow paths of the flow attachment member 220, and which are accessed through the inlet 224 and outlet 226 and confined within the stem 221. As shown, the stem 221 is relatively disposed proximate, or substantially at a center region, and generally at the open end of the housing 212. The stem 221 is shown disposed away from proximity of the perimeter wall edges of the housing 212. As one example, the stem 221 substantially is centrally disposed about a longitudinally centered axis of the fluid filter 200.

The flow attachment member 220 is connected to an inner side of a wall of the housing 212 in a fluid tight seal through the plate structure connected to the flow separator 225. In one embodiment, the housing 212 and the flow attachment member 220 are connected via a spin weld or snap fit configuration. It will be appreciated that that the connection between the flow attachment member 220 and the housing 212 may be modified as suitable and/or necessary, so long as the fluid tight seal is achieved between the housing 212 and flow attachment member 220.

A well area 215 is created when the flow attachment member 220 is connected to housing 212. In one example, the well area 215 is configured where the plate member of the flow attachment member 220 is disposed a distance inward from the open end of the housing 212. Such a configuration may further confine leakage.

Turning to the filter media 230, the filter media 230 is disposed within the housing 212. The filter media 230 is connected to an endplate 232 disposed proximate the end where the support members 216 are disposed. The filter media 230 is configured to connect with the flow attachment member 220 in a fluid tight seal. The filter media 230 is connected with another endplate 234. As shown, the filter media 230 is disposed between endplates 232, 234. The endplate 234 is disposed at an opposite end from the endplate 232, where the endplate 234 can sealingly engage with the flow attachment member 220 in a fluid tight seal.

In one embodiment, the flow attachment member 220 and the endplate 234 are connected by a press fit. As one example, the flow separator 225 includes an outer annular surface that sealingly engages with an annular surface and shoulder of the endplate 234. In such a configuration, the filter media 230 is connected with the flow attachment member 220 through a sealing engagement between the endplate 234 and the flow separator 225. In one embodiment, the filter media 230, the endplates 232, 234, and a center tube 236 (described in further detail below) together provide a cartridge assembly that is connected with the flow attachment member 220 in a fluid tight seal. It will be appreciated that the engagement between the endplate 234 and the flow attachment member 220 is not limited to the specific structure shown or to a press fit technique. Other configurations may be employed for attaching the filter media 230 to the flow attachment member 220 as desired and/or necessary, so long as the fluid tight seal is accomplished.

The filter media 230 may be constructed in various configurations, such as but not limited to a spiral wrap, pleated, insert molded, stack disc, or flow through configurations, combinations of these, or the like. As shown in FIGS. 11 and 12 the filter media 230 has a pleated configuration. It will be appreciated that the material used for constructing the filter media 230 is not limited, so long as the filter media 230 will provide the desired filtering effect for its particular application.

In FIG. 12, fluid flowing through the fluid filter 200 enters through the inlet 224 and exits through the outlet 226. As described, the stem 221 contains both the inlet 224 and outlet 226, where a flow separator 225 maintains the separate flow into and out of the fluid filter 200.

Fluid enters the housing 212 from the inlet 224 and travels to an outer side of the filter media 230 and to a space between the filter media 230 and the inner wall of the housing 212. Fluid can then be filtered through the filter media 230 to its inner side. A center tube 236 is disposed within the filter media 230. In one example, the center tube 236 cooperates with the filter media 230 in a concentric configuration, where a plurality of openings 237 allow fluid filtered by the filter media 230 to enter the center tube 236 and exit through the outlet 226. See arrows in the housing 212, filter media 230, and center tube 236. As with the filter media 230, the center tube 236 is disposed between the endplates 232, 234, and can provide further structural support for the filter media 130. As shown in one example, the endplate 234 includes the center tube 236 as an integral portion of the endplate 234.

The flow configuration shown in FIG. 12 generally provides a dual tube flow, where fluid is first directed through the inlet 224 and flow passage to the filter media, and is then directed through the outlet 226 and flow passage from the center tube 236 and filter media 230. As described, the flow attachment member 220, its stem 221, and the seal structure provide a separate incoming and outgoing flow that is localized away from edges of the housing. In such a configuration, an external seal often employed in spin-on filters between a nutplate and housing can be eliminated. Further, a nutplate in such designs may also be eliminated. See FIG. 25.

In FIG. 12, the entire flow path is shown, where the flow separator 225 includes an opening 224 a where the inlet 224 allows fluid to access the interior of the housing 212 and flow to the filter media 230. The flow separator 225 also includes an opening 226 a where fluid that has been filtered can access the outlet 226 and exit the filter media 230 and center tube 236.

As further shown in FIG. 12, a groove 219 may be disposed at an outer surface of the housing 219 and proximate the external attachment feature. In one embodiment, the groove 219 may be provided as a position for an external seal member to be disposed. It will be appreciated that the groove 219 may not be necessary for the housing 212 given the structure of the stem 221 and the sealing structure. As one example, however, the groove 219 may be a square cut groove that can hold an a-ring seal or other gasket member.

FIG. 13 illustrates another embodiment of a fluid filter 300. The fluid filter 300 includes some similar features, such as fluid filter 200, which are not further described.

The fluid filter 300 includes a flow attachment member 320 generally configured with adjacent flow passages within a stem 321. The flow configuration through the stem 321 generally resembles a full length split channeled tube.

In FIG. 13, fluid flowing through the fluid filter 300 enters through the inlet 324 and exits through the outlet 326. The stem 321 contains both the inlet 324 and outlet 226, where a flow separator 325 maintains the separate flow into and out of the fluid filter 300. Fluid filter 300 also includes a seal structure similarly disposed as fluid filter 200.

Fluid enters the housing from the inlet 324 of the stem and travels through a center tube 336 of the stem on the intake side. Fluid flows to a space between an endplate 332, connected to the filter media 330, and an inner wall of the housing. Fluid can then be filtered through the filter media 330 to its inner side and to the center tube 336. As shown, the center tube 336 is a part of the stem 321, and is disposed within the filter media 330. The center tube 336 cooperates with the filter media 330, where a plurality of openings 337 allow fluid filtered by the filter media 330 to enter the center tube 336 on the outlet side and to exit through the outlet 326. See arrows in the housing, filter media 330, and center tube 336. As shown in one example, the flow attachment member 320 includes the endplate 334 and the center tube 336 as an integral portion of the flow attachment member 320.

The flow configuration shown in FIG. 13 generally provides a full length split channeled tube. As described, the flow attachment member 320 and its stem 321 and the seal structure provide a separated incoming and outgoing flow that is localized away from edges of the housing.

FIG. 14 illustrates yet another embodiment of a fluid filter 400. The fluid filter 400 includes some similar features, such as fluid filter 200, which are not further described. The fluid filter 400 includes a flow attachment member 420 generally configured with adjacent flow passages within a stem 421. The flow configuration through the stem 421 generally resembles a full length concentrically channeled tube.

In FIG. 14, fluid flowing through the fluid filter 400 enters through the inlet 424 and exits through the outlet 426. The stem 421 contains both the inlet 424 and outlet 426, where a flow separator 425 maintains the separate flow into and out of the fluid filter 400. Fluid filter 400 also includes a relatively similar seal structure as in fluid filter 200. As shown, the seal structure may be a dual o-ring seal, where one of the seals is disposed on a tube having the inlet 424 and the other seal is disposed on a tube having the outlet 426.

Fluid enters the housing from the inlet 424 of the stem and travels through a center tube 436 of the stem 421 through the intake tube. Fluid flows to a space between an endplate 432, connected to the filter media 430, and an inner wall of the housing. Fluid can then be filtered through the filter media 430 to its inner side and back to the center tube 436. As shown, the center tube 436 is a part of the stem 421, and is disposed within the filter media 430. The center tube 436 cooperates with the filter media 430, where a plurality of openings 437 allow fluid filtered by the filter media 430 to enter the center tube 436 on the outlet side. Fluid may then exit through the outlet 426. See arrows in the housing, filter media 430, and center tube 436. As shown in one example, the flow attachment member 420 includes the endplate 434 and the center tube 436 as an integral portion of the flow attachment member 420. Further, the flow attachment member 420 includes the endplate 432 and the tube having the inlet 424 as an integral structure. In such a configuration, the flow attachment member 420 may be a part of a filter cartridge structure.

The flow configuration shown in FIG. 14 generally provides a full length concentrically channeled tube. As described, the flow attachment member 420 with its stem 421 and seal structure provide a separated incoming and outgoing flow that is localized away from edges of the housing.

FIG. 15 illustrates yet another embodiment of a fluid filter 500. The fluid filter 500 includes some similar features, such as fluid filter 200, which are not further described. The fluid filter 500 includes a flow attachment member 520 generally configured with adjacent flow passages through a stem 521. The flow configuration through the stem 521 generally resembles concentrically channeled tubes having a dual endplate.

In FIG. 15, fluid flowing through the fluid filter 500 enters through the inlet 524 and exits through the outlet 526. The stem 521 contains both the inlet 524 and outlet 526, where a flow separator 525 maintains the separate flow into and out of the fluid filter 500. Fluid filter 500 also includes a seal structure relatively similar as fluid filter 200. As shown, the seal structure may be a dual o-ring seal, where one of the seals is disposed on a tube having the inlet 524 and the other seal is disposed on a tube having the outlet 526.

Fluid enters the housing from the inlet 524 of the stem and through the intake tube. Fluid is then directed by the flow separator 525 between an outer plate member and endplate 534 (or dual endplate structure). The outer plate member is sealingly connected with the housing. Fluid flows to a space between a filter media 530 and an inner wall of the housing. Fluid can then be filtered through the filter media 530 to its inner side and to a center tube 536. As shown, the center tube 536 is a part of the stem 521, and is disposed within the filter media 530. The center tube 536 cooperates with the filter media 530, where a plurality of openings 537 allow fluid filtered by the filter media 530 to enter the center tube 536 and to flow through the exit tube. Fluid may then exit through the outlet 526. See arrows in the stem 521, housing, filter media 530, and center tube 536. As shown in one example, the flow attachment member 520 includes the outer plate member, endplate 534, and the center tube 536 as an integral portion of the flow attachment member 520.

The flow configuration shown in FIG. 15 generally provides a concentrically channeled tube with a dual endplate. As described, the flow attachment member 520 with its stem 521 and seal structure provide a separated incoming and outgoing flow that is localized away from edges of the housing.

FIG. 16 illustrates yet another embodiment of a fluid filter 600. The fluid filter 600 includes some similar features, such as fluid filter 200, which are not further described. The fluid filter 600 includes a flow attachment member 620 generally configured with adjacent flow passages through a stem 621. The flow configuration through the stem 621 generally resembles dual endplate with split flow.

In FIG. 16, fluid flowing through the fluid filter 600 enters through the inlet 624 and exits through the outlet 626. The stem 621 contains both the inlet 624 and outlet 626, where a flow separator 625 maintains the separate flow into and out of the fluid filter 600. Fluid filter 600 also includes a seal structure relatively similar as in fluid filter 200, where the seal structure may be a dual o-ring seal.

Fluid enters the housing from the inlet 624 of the stem 621. Fluid is then directed by the flow separator 625 through a flow passage and openings 624 a. A dual endplate structure 634 a, 634 b allows fluid flow through a first filter media 630. The top or outer endplate 634 a is sealingly connected with the housing. Fluid can then flow to a space between the first filter media 630 and an inner wall of the housing. Fluid may flow or drop down toward endplate 632, where it can then be filtered through a second filter media 631. Once fluid has filtered to an inner side of the second filter media 631, it then flows through openings 637 of center tube 636. Opening 626 a allows fluid to flow through the exit flow passage and through the outlet 626. See droplets shown and arrows in the stem 621, housing, first and second filter media 630, 631, and center tube 636. As shown in one example, the flow attachment member 620 includes the dual endplate 634 a, 634 b as an integral portion of the flow attachment member 620.

The flow configuration shown in FIG. 16 generally provides a dual endplate with split flow through the fluid filter and through distinct sections of filter media. As described, the flow attachment member 620 with its stem 621 and seal structure provide a separated incoming and outgoing flow that is localized away from edges of the housing.

The split flow configuration and dual endplate can allow for two-way filtering which can incorporate different filter media types. For example, one of the first and second filter media may be configured for filtering fuel, while the other of the first and second filter media may be configured for filtering water.

FIGS. 17-20 illustrate another embodiment of a fluid filter 700. The fluid filter 700 is similar to the fluid filter 100, in that fluid filter 700 includes an external attachment feature 714 disposed on an outer cylindrical surface of the flow attachment member 720. Similar components and parts are briefly mentioned as follows.

The housing 712 generally is a cylindrical container or shell and includes an end with a plurality of supporting members 716. The supporting members 716 protrude outward from the housing 712, and are radially disposed proximately to and about the end. In one embodiment, the supporting members 716 generally resemble rib-like portions. The external attachment feature 714 is disposed proximate an opposite end that the supporting members 716 are disposed. As some examples, the external attachment feature 714 may be constructed as a threaded configuration, bayonet, or the like. It will be appreciated that the supporting members 716 and the external attachment feature 714 are not limited to the specific structure shown, and may be modified using various structures as may be suitable and/or necessary.

The flow attachment member 720 is disposed at an end that is opposite the supporting members 716 and generally at an open end of the housing 712. The flow attachment member 720 is connected to the housing 712. In one embodiment, the flow attachment member 720 resembles a lid, cap, or cover-like structure having a stem 721 extending outwardly and distally relative to the end of the housing 712. The stem 721 includes an inlet 724 so that fluid to be filtered can enter the housing 712 and can access a flow path to the filter media 730. See arrows in FIG. 19. The stem 721 also includes an outlet 726 so that fluid that has been filtered by the filter media 730 can exit the housing 712. As shown, the inlet 724 and outlet 726 are confined within the stem 721 of the flow attachment member 720, where a flow separator 725 maintains flow through the inlet 724 and outlet 726 separate from each other.

FIGS. 18 and 19 also show one embodiment of a filter head 750 for connecting the fluid filter 700 to a fluid system. Internal attachment feature 751 is disposed on an inner surface of the filter head 750, and is for engaging with the external attachment feature 714 of the fluid filter 700. As some examples, the internal attachment feature 751 may be constructed as a threaded configuration, bayonet, or the like. It will be appreciated that the internal attachment feature is not limited so long as it may engage with the external attachment feature 714 of the fluid filter 700 to connect the fluid filter 700 to the filter head 750.

The filter head 750 includes an opening 752 for accessing the inlet 724 of the fluid filter 700. The filter head 750 also includes an opening 754 for accessing the outlet 726. Annular surfaces 756, 758 are disposed on inner surfaces of the filter head. The annular surfaces 756, 758 engage with a sealing structure, which is further described hereinafter.

A groove 722 is disposed about an outer surface of the stem 721. As shown, the groove 722 is disposed circumferentially around the stem 721 proximate the end, and between the inlet 724 and the end of the stem 712. In one embodiment, the groove 722 is configured as part of a sealing structure that can hold a sealing member 722 a. As shown, the sealing member 722 a is a resilient o-ring seal as one example.

Differently from the dual o-ring structure of fluid filter 100, the sealing structure of the fluid filter 700 includes one o-ring seal proximate the end of the stem 721, and a flange or face seal 722 b disposed between the o-ring seal and the end of the housing 712. The flange or face seal member 722 b may be a gasket member, such as a resilient square gasket disposed around the stem 721 and between inlet 724 and the external attachment feature 714. The face seal 722 b is disposed on an outer annular shoulder of the stem 721. It will be appreciated that the seal member 722 a and the seal member 722 b may be interchangeable as desired and/or necessary. For example, the seal member 722 b (or face seal) and annular shoulder may be disposed where the groove 722 and seal member 722 a (or o-ring) are disposed. Likewise, the groove 722 and seal member 722 a may be disposed where the seal member 722 b and annular shoulder are disposed.

Turning back to the annular surfaces 756, 758 of the filter head, these annular surfaces 756, 758 respectively engage with the sealing members 722 a, 722 b. The annular surfaces and the sealing members respectively engage in a fluid tight seal, so as to maintain separate flow paths of the inlet 724 and outlet 726 when the fluid filter 700 is connected with the filter head 750.

It will be appreciated that the sealing structure configuration may be accomplished in a variety of ways as one of skill in the art can construct. For example, the sealing structure may be constructed of various configurations, including but not limited to a dual o-ring seal as in fluid filter 100, or one o-ring seal and one face sealing gasket as fluid filter 700, or two face sealing gaskets (not shown). It further will be appreciated that o-rings and gasket seals may not be employed at all, such as where an interference fit between the stem and the filter head may accomplish a sufficient seal.

As with the other fluid filters described, the stem 721 is configured to provide a unique interface between the filtering element and a filter head. Such a unique interface would have a radially fluid tight seal at the stem 721, where flow into and out of the fluid filter 700 is localized by flow paths of the flow attachment member 720, which are accessed through the inlet 724 and outlet 726 and confined within the stem 721. As shown, the stem 721 is relatively disposed proximate, or substantially at a center region, and at the open end of the housing 712. The stem 721 is shown disposed away from proximity of the perimeter wall edges of the housing 712. As one example, the stem 721 substantially is centrally disposed about a longitudinally centered axis of the fluid filter 700.

The housing 712 and flow attachment member 720 are connected in a fluid tight seal at their outer walls. In one embodiment, the housing 712 and the flow attachment member 720 are connected via a spin weld configuration. As shown, the housing 712 includes grips 718 and the flow attachment member 720 includes grips 728. In one example, the grips 718, 728 are used to connect the housing 712 and the flow attachment member 720 through a spin-welding process. Grips 718 are disposed about an outer surface of the housing 712, while grips 728 are disposed on an outer surface of the flow attachment member 720 and radially outward from the stem 721. In one embodiment, the grips 718, 728 generally resemble sawtooth grips. It will be appreciated that that the grips are not limited to the specific structure shown, and may be modified as suitable and/or necessary. It will further be appreciated that the housing 712 and flow attachment member 720 may not be connected via spin-welding, but by some other approach, so long as the fluid tight seal is achieved between the housing 712 and flow attachment member 720.

Similarly as fluid filter 100, the filter media 730 is disposed within the housing 712. The filter media 730 is connected to an endplate 732 disposed proximate the end where the support members 716 are disposed. The filter media 730 is configured to connect with the flow attachment member 720 in a fluid tight seal. The filter media 730 is connected with another endplate 734. As shown, the filter media 730 is disposed between endplates 732, 734. The endplate 734 is disposed at an opposite end from the endplate 732, where the endplate 734 can sealingly engage with the flow attachment member 720 in a fluid tight seal.

In one embodiment, the flow attachment member 720 and the endplate 734 are connected by a press fit. As one example, the flow separator 725 includes an outer annular surface that sealingly engages with an annular surface and shoulder of the endplate 734. Thus, the filter media 730 is connected to the flow attachment member 720 through a sealing engagement between the endplate 734 and the flow separator 725. In one embodiment, the filter media 730, the endplates 732, 734, and a center tube 736 (described in further detail below) together provide a cartridge assembly that is connected with the flow attachment member 720 in a fluid tight seal. It will be appreciated that the engagement between the endplate 734 and the flow attachment member 720 is not limited to the specific structure shown or to a press fit technique, and that other configurations may be employed for attaching the filter media 730 to the flow attachment member 720 as desired and/or necessary, so long as the fluid tight seal is accomplished.

As with the previous filter media described, the filter media 730 may be constructed in various configurations, such as but not limited to a spiral wrap, pleated, insert molded, stack disc, or flow through configurations, combinations of these, or the like. As shown in FIG. 19, the filter media 730 has a pleated configuration having folds 731. It will be appreciated that the material used for constructing the filter media 730 is not limited, so long as the filter media 730 will provide the desired filtering effect for its particular application.

In FIG. 19, fluid flowing through the fluid filter 700 enters inlet 724 and exits outlet 726. The stem 721 contains both the inlet 724 and outlet 726, where a flow separator 725 maintains the separate flow into and out of the fluid filter 700. While the flow path of fluid is not completely shown in FIG. 19, it will be appreciated that fluid filter 700 employs a similar flow path construction as shown in FIGS. 9 and 10 of fluid filter 100, except that the flow path is reversed. That is, the inlet 724 and outlet 726 are switched, such that fluid to be filtered enters the side of the stem 721, and fluid that has been filtered exits the end of the stem 721. In such a configuration, the fluid filter 700 can operate as a standard spin-on type fluid filter, where filtered fluid exits the center and top of the fluid filter. Even further, the fluid filter can be adapted for use in existing fuel and oil filtration systems employing traditional spin-on type fluid filters.

As shown by FIG. 19, fluid enters the housing 712 from the inlet 724 and travels to an outer side of the filter media 730 and to a space between the filter media 730 and the inner wall of the housing 712. Fluid can then be filtered through the filter media 730 to its inner side. A center tube 736 is disposed within the filter media 730. In one example, the center tube 736 cooperates with the filter media 730 in a concentric configuration, where a plurality of openings 737 allow for fluid filtered by the filter media 730 to enter the center tube 736 and exit through the outlet 726. As with the filter media 730, the center tube 736 is disposed between the endplates 732, 734, and can provide further structural support for the filter media 730.

The flow configuration of FIGS. 17-20 provide a generally radial fluid flow at first, where fluid is directed radially outward to a position between the filter media 730 and housing 712. As described, the flow attachment member 720, its stem 721, and the seal structure provide a separated incoming and outgoing flow that is localized away from edges of the housing. In such a configuration, an external seal often employed in spin-on filters between a nutplate and housing can be eliminated. Further, a nutplate in such designs may also be eliminated. See FIG. 25.

FIGS. 21-24 illustrate another embodiment of a fluid filter 800. The fluid filter 800 is similar to the fluid filter 100, except that fluid filter 800 includes an external attachment feature 814 is disposed on an outermost cylindrical surface of the flow attachment member 820. Similar components and parts are briefly mentioned as follows.

The fluid filter 800 includes a housing 812. The housing 812 generally is a cylindrical container or shell. The housing 812 includes an end with a plurality of supporting members 816. The supporting members 816 protrude outward from the housing 812, and are radially disposed proximately to and about the end. In one embodiment, the supporting members 816 generally resemble rib-like portions. The external attachment feature 814 is disposed proximate an opposite end that the supporting members 816 are disposed. As some examples, the external attachment feature 814 may be constructed as a threaded configuration, bayonet, or the like. It will be appreciated that the supporting members 816 and the external attachment feature 814 are not limited to the specific structure shown, and may be modified using various structures as may be suitable and/or necessary.

The flow attachment member 820 is disposed at an end that is opposite the supporting members 816, and is connected to the housing 812. In one embodiment, the flow attachment member 820 resembles a lid, cap, or cover-like structure having a stem 821 extending outwardly and distally relative to the open end of the housing 812. The stem 821 includes an inlet 824 so that fluid to be filtered can enter the housing 812 and can access a flow path to the filter media 830. See arrows in FIG. 24. The stem 821 also includes an outlet 826 so that fluid that has been filtered by the filter media 830 can exit the housing 812. See FIG. 23. As shown, the inlet 824 and outlet 826 are confined within the stem 821 of the flow attachment member 820, where a flow separator 825 maintains flow through the inlet 824 and outlet 826 separate from each other.

FIG. 23 also shows one embodiment of a filter head 850 for connecting the fluid filter 800 to a fluid system. Internal attachment feature 851 is disposed on an inner surface of the filter head 850, and is for engaging with the external attachment feature 814 of the fluid filter 800. As some examples, the internal attachment feature 851 may be constructed as a threaded configuration, bayonet, or the like. It will be appreciated that the internal attachment feature 851 is not limited so long as it may engage with the external attachment feature 814 of the fluid filter 800 to connect the fluid filter 800 to the filter head 850.

The filter head 850 includes an opening 852 for accessing the inlet 824 of the fluid filter 800. The filter head 850 also includes an opening 854 for accessing the outlet 826. Inlet line 852 a connects to the opening 852 and outlet line 854 a connects to the opening 854 to facilitate delivery of fluid to and from the fluid filter 800. In one embodiment shown in FIG. 23, the inlet line 852 a and outlet line 854 a are constructed with fitment ends that respectively mate with the openings 852, 854.

The filter head 850 further includes annular surfaces 856, 858 disposed on inner surfaces of the filter head. The annular surfaces 856, 858 engage with a sealing structure, which is further described hereinafter.

A groove is disposed about an outer surface of the stem 821. As shown, the groove is disposed circumferentially around the stem 821 proximate the end, and between the inlet 824 and the end of the stem 812. In one embodiment, the groove is configured as part of a sealing structure that can hold a sealing member 822 a. As shown, the sealing member 822 a is a resilient o-ring seal as one example.

Differently from the dual o-ring structure of fluid filter 100, the sealing structure of the fluid filter 800 includes one o-ring seal proximate the end of the stem 821, and a flange or face seal 822 b disposed between the o-ring seal and the end of the housing 812. That is, the sealing structure configuration is similar to that of the fluid filter 700 in FIGS. 17-20. The flange or face seal member 822 b may be a gasket member, such as a resilient square gasket disposed around the stem 821 and between inlet 824 and the external attachment feature 814. The face seal 822 b is disposed on an outer annular shoulder of the stem 821. It will be appreciated that the seal member 822 a and the seal member 822 b may be interchangeable as desired and/or necessary. For example, the seal member 822 b (or face seal) and annular shoulder may be disposed where the groove 822 and seal member 822 a (or a-ring) are disposed. Likewise, the groove 822 and seal member 822 a may be disposed where the seal member 822 b and annular shoulder are disposed.

Turning back to the annular surfaces 856, 858 of the filter head, these annular surfaces 856, 858 respectively engage with the sealing members 822 a, 822 b. The annular surfaces and the sealing members respectively engage in a fluid tight seal, so as to maintain separate flow paths of the inlet 824 and outlet 826 when the fluid filter 800 is connected with the filter head 850.

It will be appreciated that the sealing structure configuration may be accomplished in a variety of ways as one of skill in the art can construct. For example, the sealing structure may be constructed of various configurations, including but not limited to a dual o-ring seal as in fluid filter 100, or one o-ring seal and one face sealing gasket as fluid filters 700, 800, or two face sealing gaskets (not shown). It further will be appreciated that o-rings and gasket seals may not be employed at all, such as where an interference fit between the stem and the filter head may accomplish a sufficient seal.

As with the other fluid filters described, the stem 821 is configured to provide a unique interface between the filtering element and a filter head. Such a unique interface would have a radially fluid tight seal at the stem 821, where flow into and out of the fluid filter 800 is localized by flow paths of the flow attachment member 820, which are accessed through the inlet 824 and outlet 826 and confined within the stem 821. As shown, the stem 821 is relatively disposed proximate, or substantially at a center region, and generally at the open end of the housing 812. The stem 821 is shown disposed away from proximity of the perimeter wall edges of the housing 812. As one example, the stem 821 substantially is centrally disposed about a longitudinally centered axis of the fluid filter 800.

The housing 812 and flow attachment member 820 are connected in a fluid tight seal at their outer walls. In one embodiment, the housing 812 and the flow attachment member 820 are connected via a spin weld configuration. As shown, the housing 812 includes grips 818 and the flow attachment member 820 includes grips 828. In one example, the grips 818, 828 are used to connect the housing 812 and the flow attachment member 820 through a spin-welding process. Grips 818 are disposed about an outer surface of the housing 812, while grips 828 are disposed on an outer surface of the flow attachment member 820 and radially outward from the stem 821. In one embodiment, the grips 818, 828 generally resemble sawtooth grips. It will be appreciated that that the grips are not limited to the specific structure shown, and may be modified as suitable and/or necessary. It will further be appreciated that the housing 812 and flow attachment member 820 may not be connected via spin-welding, but by some other approach, so long as the fluid tight seal is achieved between the housing 812 and flow attachment member 820.

As with the other fluid filters described, the filter media 830 is disposed within the housing 812. The filter media 830 is connected to an endplate 832 disposed proximate the end where the support members 816 are disposed. The filter media 830 is configured to connect with the flow attachment member 820 in a fluid tight seal through another endplate 834. The filter media 830 is connected with the endplate 834. As shown, the filter media 830 is disposed between endplates 832, 834. The endplate 834 is disposed at an opposite end from the endplate 832, where the endplate 834 can sealingly engage with the flow attachment member 820 in a fluid tight seal.

In one embodiment, the flow attachment member 820 and the endplate 834 are connected by a press fit. As one example, the flow separator 825 includes an outer annular surface that sealingly engages with an annular surface and shoulder of the endplate 834. Thus, the filter media 830 is connected to the flow attachment member 820 through a sealing engagement between the endplate 834 and the flow separator 825. In one embodiment, the filter media 830, the endplates 832, 834, and a center tube 836 (described in further detail below) together provide a cartridge assembly that is connected with the flow attachment member 820 in a fluid tight seal. It will be appreciated that the engagement between the endplate 834 and the flow attachment member 820 is not limited to the specific structure shown or to a press fit technique, and that other configurations may be employed for attaching the filter media 830 to the flow attachment member 820 as desired and/or necessary, so long as the fluid tight seal is accomplished.

As with the previous filter media described, the filter media 830 may be constructed in various configurations, such as but not limited to a spiral wrap, pleated, insert molded, stack disc, or flow through configurations, combinations of these, or the like. As shown in FIG. 23, the filter media 830 has a pleated configuration having folds 831. It will be appreciated that the material used for constructing the filter media 830 is not limited, so long as the filter media 830 will provide the desired filtering effect for its particular application.

In FIGS. 23 and 24, fluid flowing through the fluid filter 800 enters inlet 824 and exits outlet 826. The stem 821 contains both the inlet 824 and outlet 826, where the flow separator 825 maintains the separate flow into and out of the fluid filter 800. While the flow path of fluid is not completely shown in FIG. 23, it will be appreciated that fluid filter 800 employs a similar flow path construction as shown in FIGS. 9 and 10 of fluid filter 100. See also flow direction of FIG. 24. That is, fluid to be filtered enters the top end of the stem 821, and fluid that has been filtered exits through the side of the stem 821.

Fluid enters the housing 812 from the inlet 824 and travels to an outer side of the filter media 830 and to a space between the filter media 830 and the inner wall of the housing 812. Fluid can then be filtered through the filter media 830 to its inner side. A center tube 836 is disposed within the filter media 830. In one example, the center tube 836 cooperates with the filter media 830 in a concentric configuration, where a plurality of openings 837 allow for fluid filtered by the filter media 830 to enter the center tube 836 and exit through the outlet 826. As with the filter media 830, the center tube 836 is disposed between the endplates 832, 834, and can provide further structural support for the filter media 830.

FIG. 24 further illustrates another version of a filter head 860. The filter head is adaptable for connection with a fluid filter, such as fluid filter 800. The filter head 860 also includes an internal attachment feature 861 similar to internal attachment feature 851. Openings 862, 864 respectively communicate with the inlet 824 and the outlet 826. Differently from openings 852, 854, the openings 862, 864 include ends with internal threads. As one example, the internal threads are adapted for attaching to filtration system lines in a threaded engagement. The filter head also includes annular surfaces 866, 868 that engage with the sealing structure of the fluid filter (i.e. sealing members 822 a, 822 b), and are similar to the annular surfaces 856, 858.

The flow configuration of FIGS. 21-24 provide a generally radial fluid flow at first, where fluid is directed radially outward to a position between the filter media 830 and housing 812. As described, the flow attachment member 820 including its stem 821 and seal structure provide a separated incoming and outgoing flow that is localized away from edges of the housing. In such a configuration, an external seal often employed in spin-on filters between a nutplate and housing can be eliminated. Further, a nutplate in such designs may also be eliminated. Even further, the flow configuration provided by the flow attachment member 820 allows for a pre-filtering function over such standard spin-on type fluid filter. That is, when the fluid filter 800 is pre-filled through the center of the stem or the inlet 824, the fluid is filled on the unfiltered or “dirty side” of the fluid filter 800. Thus, the fluid must be pre-filtered before it can exit the fluid filter 800. Such a configuration is different from traditional spin-on type filters, where the fluid is pre-filled through the center, which is the outlet or the “clean side,” and where the pre-filled fluid is allowed to immediately exit the fluid filter, rather than being filtered beforehand.

Turning back to FIG. 25, it will be appreciated that the inventive concepts of the fluid filters described herein may be retroactively used with existing fluid filter housings, and including features such as but not limited to the flow attachment member and seal configurations described. For example, by at least eliminating the nutplate 914 many of the flow attachment members described may be employed in such known spin-on filters. Further, the center tube may also be modified accordingly to accommodate any of the inventive flow attachment members described, and if necessary replaced entirely.

In yet another embodiment, the flow attachment member may be configured as a separate adapter structure, which can also be connected to a head of an already existing fluid filter. As one example, the flow attachment member can be configured as an adapter for use with traditional spin-on filters, such as shown in FIG. 25, and without removing the existing nutplate. Such a flow attachment member would connect to and seal the separate flow openings of the existing filter's nutplate. More specifically, the flow attachment member would direct unfiltered fluid and filtered fluid through its separating structure. In such a configuration, fluid flow can be re-routed through the flow attachment member, while allowing usual flow within a standard style filter (e.g. spin-on filter).

FIGS. 26-30 illustrate another embodiment of a flow attachment member 1020. The flow attachment member 1020 includes similar flow channel and seal structure features as the above-described flow attachment members. It will be appreciated that many of the inventive principles of the above-described flow attachment members may be suitably incorporated in the flow attachment member 1020.

The flow attachment member 1020 includes a stem 1021 having an inlet 1024 and outlet 1026. The inlet 1024 and outlet 1026 are disposed on the stem 1021, where the stem 1021 includes a separating structure 1025 to maintain the separate incoming and outgoing flow through the flow attachment member 1020. As with other flow attachment members described, the flow attachment member 1020 localizes incoming and out going flow within the stem 1021, such as when the flow attachment member is connected to a fluid filter, for example a traditional spin-on type. A groove 1022 is disposed proximate the outlet 1026. The groove 1022 may house an o-ring or a gasket seal (not shown), and provides the necessary sealing structure to further facilitate localizing fluid flow, and further enjoys the sealing structure benefits as those flow attachment members described above.

The flow attachment member 1020 includes external attachment features 1014, 1014 a. The external attachment features 1014 are useful for respectively attaching the flow attachment member 1020 to a component 1030 of a filtration system and to a fluid filter (e.g. spin-on filter of FIG. 25). As shown in FIGS. 29 and 30, the external attachment feature 1014 can connect to the component 1030 of a filtration system, and the external attachment feature 1014 a is available to connect to a fluid filter. As one example only, the external attachment feature 1014 may connect with opening 920 of the spin-on filter 900 of FIG. 25. In such a configuration, the outlet 1026 communicates with opening 920 to allow fluid to exit the fluid filter 900, and inlet 1024 communicates with opening(s) 922 to allow fluid to enter the fluid filter 900 for filtering. The external attachment features 1014, 1014 a may be a threaded configuration, bayonet, or the like. It will be appreciated that the external attachment features 1014, 1014 a are not limited to the specific structure shown, and may be modified using various structures as may be suitable and/or necessary.

The fluid filters described can provide many benefits such as allowing for a more clean service, since flow into and out of the fluid filter is localized within the flow attachment member. As a result, a filter can be provided that is more environment friendly and is more pleasing to customers and users. The fluid filter described herein also can substantially prevent or at least confine leakage, if any, to a localized area and away from proximity of edges of the housing, since a seal structure is provided on the flow attachment member. Thus, additional external and internal seals can be eliminated, where a fluid filter can be provided that is relatively inexpensive, reliable, and has fewer parts. Further, the flow attachment can eliminate the need for a nutplate as employed in many fluid filters, such as typically employed in spin-on type fluid filters, which substantially reduces the cost associated with the filter as well as enables the device to consist of mostly non-metallic components. The housing itself may also be made of metallic or plastic material and have an embedded or press-fit cartridge style filter media pack. The filter media pack can be one unit which is attached to the housing via spin-weld, ultrasonic, adhesive, etc. Further, variations of the filter media design can be considered, where two different types of filter media that could be used for fuel water separation. The flow attachment can provide a unique head and filter interface that may give OEM improved aftermarket business.

More specifically, the filters described can be produced as a fully disposable molded plastic filter without the inclusion of a nutplate. Further, the flow attachment member may be molded or formed as one single component (as opposed to multiple parts to create the separate flow channels.) The inlet and outlet flow are channeled generally through the center portion of the filter housing. The protrusion of the channels may be utilized to operate a valve for fluid shut-off within the filter head during service. The aforementioned filters can allow the filter to seal radially against the head's inlet and outlet while maintaining a leak free environment. As noted, leakage during removal can be confined to the flow attachment structure and seepage around the filter edges can be substantially eliminated.

In addition, as the fluid flow can be localized, the need for an outer seal can be eliminated, thus creating a unique encapsulated filtration environment. As a result, traditional outer o-ring seal and square-cut gasket can be eliminated in favor of a simplified stem seal configuration. The ability to create a unique attachment method is increased substantially by confining the fluid flow within the sealed portion of the filter.

The separated but confined flow design can be integrated within existing user-friendly filter product architecture to utilize the media cartridges and shell design as well as be manufactured on the same assembly line.

Even further, the flow attachment member can provide a benefit of pre-filling a fluid filter in the unfiltered containment region, such as the “dirty side.” The flow attachment member disclosed herein utilizes a flow redirection concept through the flow attachment member that effectively diverts pre-filled fluid through the filtration media before it can enter the fuel system. That is, the flow attachment member described herein can allow for a pre-filtering function of the pre-filled fluid before the fluid is allowed to enter exit the fluid filter. Such a flow redirection can be particularly helpful to newer high-pressure common rail fuel systems that require fine particle filtration.

The invention may be embodied in other forms without departing from the spirit or novel characteristics thereof. The embodiments disclosed in this application are to be considered in all respects as illustrative and not limiting. The scope of the invention is indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are intended to be embraced therein. 

What is claimed is:
 1. An outer cap for an exterior of a fluid filter housing, the outer cap comprising: a stem configured to communicate a fluid to be filtered to the fluid filter housing, configured to communicate the fluid out of the fluid filter housing, and configured to localize fluid flow both into and out of the outer cap; a flow separator configured to maintain separate flow channels for the fluid flowing into and out of the outer cap, the stem and flow separator formed within the outer cap such that the outer cap is formed as a single component; and a seal structure disposed about an outer surface of the stem, the seal structure configured to substantially prevent or confine leakage from the stem, wherein the outer cap is configured to attach to the fluid filter housing, the fluid filter housing is configured to contain a filter cartridge, and at least a portion of the fluid filter housing is configured to contact the fluid.
 2. The outer cap of claim 1, wherein the stem further comprises an inlet, the inlet allowing the fluid to enter the stem.
 3. The outer cap of claim 2, wherein the stem further comprises an outlet, the outlet allowing the fluid to exit the stem.
 4. The outer cap of claim 3, wherein the inlet and the outlet define adjacent flow passages.
 5. The outer cap of claim 4, wherein the inlet and the outlet have a common wall.
 6. The outer cap of claim 1, wherein the seal structure includes at least one sealing member circumferentially disposed on the outer surface of the stem.
 7. The outer cap of claim 6, wherein the sealing member comprises at least one of a resilient o-ring or a flange seal with a gasket member.
 8. The outer cap of claim 1, wherein the flow separator is disposed proximate a center region of the outer cap and away from proximity of an outer edge of the housing.
 9. The outer cap of claim 1, wherein the stem is disposed at a center region of the outer cap, where fluid flow into and out of the fluid filter device is concentrated proximate the center.
 10. The outer cap of claim 1, wherein the seal structure includes a plurality of sealing members, and wherein each of the plurality of sealing members are selected from a group consisting of a single resilient o-ring, a single flange seal with a resilient gasket member, or an o-ring.
 11. The outer cap of claim 1, wherein the seal structure includes a plurality of sealing members, and wherein each of the plurality of sealing members are disposed circumferentially about the stem, and the sealing members are axially disposed relative to one another.
 12. The outer cap of claim 1, wherein the outer cap is configured to allow the fluid filter housing to be pre-filled in an unfiltered region.
 13. The outer cap of claim 1, further comprising grips disposed on an outer surface of the outer cap radially outward from the stem.
 14. The outer cap of claim 13, wherein the grips comprise saw-tooth grips.
 15. The outer cap of claim 1, wherein the outer cap is configured to form a fluid tight seal with the fluid filter housing.
 16. The outer cap of claim 1, wherein the outer cap is configured to form a press fit connection to an endplate of a filter cartridge disposed in the fluid filter housing.
 17. The outer cap of claim 16, wherein the flow separator comprises an outer annular surface configured to sealingly engage an annular surface and shoulder of the endplate.
 18. The outer cap of claim 1, further comprising an external attachment feature configured to engage a fluid filtration system.
 19. The outer cap of claim 18, wherein the external attachment feature comprises threads.
 20. The outer cap of claim 19, wherein the external attachment feature is disposed on an outer cylindrical surface of the outer cap.
 21. The outer cap of claim 18, wherein the external attachment feature comprises a bayonet connection.
 22. An outer cap for an exterior of a fluid filter housing, the outer cap comprising: a stem configured to communicate a fluid to be filtered to the fluid filter housing, configured to communicate the fluid out of the fluid filter housing, and configured to localize fluid flow both into and out of the outer cap; a flow separator configured to maintain separate flow channels for the fluid flowing into and out of the outer cap, the stem and flow separator formed within the outer cap such that the outer cap is formed as a single component; a seal structure including means for substantially preventing or confining leakage from the stem; and means for attaching the outer cap to the fluid filter housing; wherein the fluid filter housing is configured to contain a filter cartridge, and at least a portion of the fluid filter housing is configured to contact the fluid.
 23. The outer cap of claim 22, wherein the means for attaching the outer cap to the housing includes a portion of the outer cap configured to spin weld with the fluid filter housing.
 24. The outer cap of claim 22, further comprising means for gripping the outer cap during a spin welding process.
 25. The outer cap of claim 22, further comprising means for forming a fluid tight connection with the filter cartridge. 